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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1bc4ac02f78171fbe72e59ffb47f4d0f7472a0f27d9cd00ba11e5b464040b01c' 
  AND token = 'lyM/PWtrQs08IZGegAzgcyMMnoMuHliQI6ylmbfc7wM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}